public class Product 
 {
 public string name { get; set; }
 public string des { get; set; }
 public string place { get; set; }
 }

 public class ProductValidator : AbstractValidator<Product>
 {
 public ProductValidator()
 {
 RuleFor(product => product.name).NotNull().NotEmpty();//name 字段不能為null,也不能為空字符串
 }
 }

public static class WebApiConfig
{
 public static void Register(HttpConfiguration config)
 {
 // Web API routes
 ...
 FluentValidationModelValidatorProvider.Configure(config);
 }
}

public class ValidateModelStateFilter : ActionFilterAttribute
{
 public override void OnActionExecuting(HttpActionContext actionContext)
 {
 if (!actionContext.ModelState.IsValid)
 {
 actionContext.Response = actionContext.Request.CreateErrorResponse(HttpStatusCode.BadRequest, actionContext.ModelState);
 }
 }
}

public static class WebApiConfig
{
 public static void Register(HttpConfiguration config)
 {
 // Web API configuration and services
 config.Filters.Add(new ValidateModelStateFilter());

 // Web API routes
 ...

FluentValidationModelValidatorProvider.Configure(config);
 }
}

[ValidateModelStateFilter]
public class ProductController : ApiController
{
 //具體的邏輯
}